INITIAL DYNAMIC SUSCEPTIBILITY OF BIOCOMPATIBLE MAGNETIC FLUIDS

P.C. Morais, L.B. Silveira, A.C. Oliveira and J.G. Santos

Abstract

Biocompatible magnetic fluid samples containing magnetite nanoparticle surface-coated with
dextran or dimercaptosuccinic acid (DMSA) were investigated using dynamic susceptibility
measurements. Room-temperature investigations of the susceptibility peak position (imaginary
component) as a function of the samples nanoparticle concentrations (from 1014
to 1016 nanoparticle/cm3) were performed in the limit of low external
applied magnetic field (150 Oe). Analyzes of the imaginary components include both the
particle size polydispersity profile and particle-particle interaction.